<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <input type="text" v-model="n1">
    <input type="text" v-model="n2">
    <input type="button" value="加" @click="f('+')">
    <input type="button" value="减" @click="f('-')">
    <input type="button" value="乘" @click="f('*')">
    <input type="button" value="除" @click="f('/')">
    <h1>结果:{{result}}</h1>
</div>
<script src="js/vue.min.js"></script>
<script>
    let v = new Vue({
        el: "body>div",
        data: {
            n1: "",
            n2: "",
            result: ""
        },
        methods: {
            f(x) {
                //eval() 可以将字符串变成代码运行
                v.result = eval(v.n1+x+v.n2);
            }
        }
    })
</script>
</body>
</html>